<template>
  <div class="m-side">
    <el-row class="tac">
      <el-col :span="3">
        <el-menu default-active="2" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose">
          <el-submenu index="1">
            <template slot="title"><i class="el-icon-message"></i>导航一</template>
            <el-menu-item-group>
              <template slot="title">分组一</template>
              <el-menu-item index="1-1">选项1</el-menu-item>
              <el-menu-item index="1-2">选项2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分组2">
              <el-menu-item index="1-3">选项3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="1-4">
              <template slot="title">选项4</template>
              <el-menu-item index="1-4-1">选项1</el-menu-item>
            </el-submenu>
          </el-submenu>
          <el-menu-item index="2"><i class="el-icon-menu"></i>导航二</el-menu-item>
          <el-menu-item index="3"><i class="el-icon-setting"></i>导航三</el-menu-item>
        </el-menu>
      </el-col>
    </el-row>
  </div>
</template>

<script>
  export default {
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      }
    }
  }
</script>

<style lang="less" scope>
  .el-menu {
    
  }
</style>
